WW refuses to close account

I've been trying to close my account for the past six weeks (started end of December). As I have emigrated recently, I've been forced to rely on the woolworths email address that was great at the time. Quick responses, helpful questions. However, that joyride was over soon. Woolworths failed to acknowledge my payment of the outstanding balance and its been weeks since I last heard from them, despite following up on numerous occasions. I need this account closed and now have been paying account fees because Woolworths refuses to close my account. This kind of behaviour is unacceptable and I'm livid that they keep refusing to assist.